Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbd707cde71ab8c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 04:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b2ac332cd53f113b5e9713275568106 SHA-1: ac1a8588e30b3c07ed44b2a79ef0fb4f4ee69e1a SHA-256: adbd707cde71ab8cca9aa3b072402f2b9309beb3431d2bc021b5a8d599cdd6a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=android+sdk+adb+path PDF link annotation
    • http://zespolbahamas.pl/zdjecia/file/jatodumiwubased.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/lexokulosebuwamuxivo.pdfIn PDF document text
    • http://taigesw.com/upload/files/taborobokenusovukikug.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/wunag.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tefosejusoxitifemu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/945e78ac2345c297a71e38ebc9e2f1b5/79236636221.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/nolejaketek.pdfIn PDF document text
    • http://shesob.com/file/files/14346107318.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/4235116835.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/12787443312.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/86893157054.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/89051004284.pdfIn PDF document text
    • http://m-astar.com/UserFiles/files/rosumasebuju.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/rodesa.pdfIn PDF document text
    • https://flomogroup.com/upload/files/76254383245.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/zulekojumekikafavavetuse.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210925055257.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091515310373499.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zijozadelaf.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/rilufilogus.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/sivobutibiferud.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/92275101662.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03A 18028 bytes
SHA-256: f0ca102aa9be59d97ac113d1ccfc66cec2273ab922e2d77f732a014741f6a5ed
font_01_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 10524 bytes
SHA-256: 0e443bf57309a451206b3a9ad877900a4d7fda1f02194ae3ed4b4f515a7e1916
font_02_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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